I have a 99 Honda Foreman with the electronic shift. 9000 k's and still ticking. Pretty good on fuel and goes all over the place from deep loon $hit to steep climbing. While it will not keep up to the go like heck set as they tear down logging roads and trails it excels at getting me into where I want to be and later hauling out what I killed. I have not had any issues with ground clearance although I do run a very aggressive set of tires on it. I would certainly buy another and I understand Honda still makes the Foreman line.
My second is a 06 Polaris 800 2 up. Good machine, actually more power than one needs. Great climber and good all around. The independent suspension makes it easier to drive all day compared to the Honda with the solid rear axle. No issues with it either.
Of the two I think I trust the Honda more. It is a basic, economical, tough, reliable machine.
I rented quads for a number of years before buying one, including: Honda, Polaris, Yamaha, Suzuki, Bombardier, and Arctic Cat. Yamaha is the only machine I have used that stranded me - twice! I personally would never touch one. Having said that it may have been my bad luck. Apart from those cheap Canadian Tire ones I think most of them are pretty good and it comes down to your preferences and quality of your local dealerships.